If you have a small company or if you do not have the resources to setup a SharePoint server, there are some free solutions available to help you create your own help desk. Here are some options that may be suitable to support your requirements.
SysAidIT offers a free version of its help desk solution as well as a Pro and Enterprise package. The pricing for the other options was not listed on the website, but you can register and request pricing. Ideal for smaller organizations, SysAid IT Free Edition is a light and fully-functional help desk software solution that supports up to two administrators and 100 assets. The free edition contains the core modules of the paid solutions to get you started. This edition comes with the following modules: Help Desk, End-User Web Portal, Knowledge Base, Asset Management, Remote Control, Reports and Analysis, IT Performance Benchmarking, Online Chat, Calendar and Scheduling, and Mobile Apps. You can download the program for Windows or Linux. Some features that require the upgrade to a paid solution include the ability to customize reports and the site logo and design.
Spiceworks has a few different free solutions available to help IT professionals. One of them is their free help desk software. The solution allows you to create and customize an IT Help Desk Portal. You can update help desk tickets, receive service requests, post IT alerts, share maintenance schedules, and provide contact info and more, all from an easy-to-configure, customizable web portal. This solution is ad supported and you also have to option to use SpiceWorks MyWay which allows you to remove the ads and use your logo for $ 30 per month (or $ 330 per year).
Web Help Desk offers a free solution without ads. This solution features include: self service and Ticket Submission Portal, email to ticket conversion, Knowledge Base, 2-way email communications, SLA email alerts and reminders, LDAP and AD integration, and help desk performance reports. A Lite and Pro edition are also available for additional cost. The Pro edition also contains asset management, change management, task management, survey management, and billing and parts management.